Day shares third at six under alongside five others including five-time major victor Phil Mickelson. "I think history was made as far as my career, I don't think I've ever done that before, certainly in competition".
Although the Queenslander's drought is nearly out to three years, Scott feels he is on the cusp of reclaiming his top form as he prepares for this week's Pebble Beach Pro Am in California.
Phil Mickelson hit every fairway for the first time in 21 years on his way to a six-under 65 at Monterey Peninsula, an ideal start Thursday on perhaps the last ideal day at the AT&T Pebble Beach Pro-Am.
The tournament, which sees professionals play alongside celebrities, is spread across three courses near the picturesque town of Carmel - Pebble Beach Golf Links, Spyglass Hill Golf Course and Monterey Peninsula.
"It was great out there today and it's nice to get off to a good start", said Gay, who has won four times on the PGA Tour, but not since the 2013 Humana Challenge.
Hosung Choi, a two-time victor on the Japan Golf Tour whose extravagant body English after every shot made him an internet sensation, came back after a poor start.
Kearney returns from injury for Scotland clash
Schmidt confirmed to the BBC that Sexton had failed a HIA but expects him to recover quickly. Ireland were dealt a cruel blow when Johnny Sexton was forced off with a head injury.
Spieth, who hasn't won since the 2017 Open Championship and hasn't had a top-20 since last year's Open Championship, took advantage of the pleasant conditions and made birdie on two of his final three holes to move up the leaderboard.
Brandt Snedeker produced a contender for birdie of the year after he made a four on the iconic 18th despite pulling his drive onto the beach in the Pebble Beach Pro-Am.
Cody Gribble had a 6-under 66 at Spyglass Hill and Si Woo Kim had a 6-under 66 at Pebble Beach.
Pebble Beach will also host the U.S. Open in June when the course is likely to be much drier than the damp, lush conditions that will greet players this week after recent heavy rains.
Most of the big names on Thursday were at Monterey, where Australian Jason Day matched Mickelson's 65, while Americans Dustin Johnson and Jordan Spieth fired 66. The players will likely have to shrug off foul weather heading toward the Monterey Peninsula.
"I'm very close to getting back to where I need to be".